Dial-fastener



PATENT oFFlcE.

ammi comma, lor ravanmzs, a.:

DIAL-FASTWEB.

Speeication of Letters Patent.

Patented Dec. 13, 1921.

Application Med July 12, 1920. Serial No. 395,801.

T o all whom t may con-cem:

Be it known that I, HENRI CoLoMB, a citizen of the Republic of Switzerland, residing at Tavannes, Switzerland, have invented certain new and vuseful Improvements in Dial-Fasteners, of which the following is a specification.

The object of the present invention is a means for fixing the dials of watches, clocks andthe like which comprises one or more split nuts having a conical shoulder, cooperating with a conical recess in the inner face .of the case plate, so as to cause the thread to bite in the material forming the foot of the dial as it is screwed upon the said foot, in roportion to its advance thereon, the shou der of the nut serving also to center it within the said recess.

The preferred form of the invention is illustrated by way of example in the accompanying drawing in which- Figure l illustrates a split nut partly in section, andA Fig. 2 represents an axial section of the complete arrangement on a smaller scale than Fig. 1. i

In the drawings, the dial a carries oneor morefeet b each .of which is ixed as usual and traverses the case-plate e by means of a hole -of considerabl larger diameter than that of the foot. llhe upper Aart of this hole is slightly enlarged or beve ed as shown 'at f to receive the conical shoulder c of a split nut d having a fairly sharp triangular thread and adapted to be operated y -a screw-driver. At the commencement of the pitch of the thread, the bore of the nut is slightly chamfered as shown at g so that there is no difliculty in placing it on the ex` tremity of the foot b, as a light pressure by means of the screw-driver expands the edge of the nutslightly andfacilitates the introduction of the foot. As the nut is rotated, its thread bites in the material of the foot and owing to the engagement of the conical portion c with the conical screw b of the case-plate, is pressed increasingly into the material of the foot which is gradually secured with an extremely sure grip.

If desired, the holes of the plate through which the feet pass maybe given a diameter sufficiently large that if the said feet are not accurately placed, they may beset within the holes by suitably inclining their axes. For thls purpose, the feet of the dial are formed with a light groove permitting them to be oriented according to need.

I claim 1. The. means for fastening dials comprismg a dlal, feet extending rearwardly of said dial, a case-plate having holes to reaol ceive said feet, said holes being of larger diameter than said feet, the rearward edges of said holes being beveled outwardly, a split nut screwed on each of said feet, said spltnut having an external conicallshoulder engaged by the bevel of the hole in the case-plate so as to press the'l said nut u on the pin as it advances and cause it to ite a thread into the material of the corresponding foot.

2. Means for fastening dials comprisin a dial, feet extending rearwardly o f sai dial, a case-plate having holes to receive said feet, said holes being of larger diameter than said feet, the rearward edges of said holes being beveled outwardly, a split nut screwed on each of said feet, said split nut having an external conical shoulder engaged by the bevel of the hole in the caseplate so as to press the said nut uponv the pin as it advances and cause it to a thread into the material of the corres 'onding foot, the bore of the said nut in chamfered to facilitate its being place upon the foot.

v 3.`Means for fastening dials comprisin a dial, feet extending rearwardly of sai dial, a case-plate having holes to receive said feet, said holes being of lar r diamamter than said feet, the rearwar edges of said holes being beveled outwardly, a split nut screwed on each of said feet, said split nut having an external conical shoulder engaged by the bevel of the hole in the caseplate so as to press the said nut upon the pin as it advances and cause it to bite a thread into the material of the correspgnding foot, the bore of the said nut in chamfered to facilt'ate its bein pla upon the foot and the feet being ,ormed to permit a slight bending thereof in order to permit accurate engagement between said*y split nut and feet.

4. A combination with e, dial having feet In testimony whereof I have hereunto set adapted to copeiate with openin formed my hand in presence of two subscribing wit- 10 in a, cese plate of e split nut interior y threednesses. ed to engage the upper end of the'feet, and HENRI COLO 5 coperatmg means on the case plate and nut to cause 'the threads on the nut to bite into Witnesses: the engsg'ed foot 'ofothe dia with increasing E. PAVKD, pessure es the mit 1s advanced. v Mf Roms. 

